Window frame



FIG. 1 is a perspective view of a window frame showing my new design;

FIG. 2 is another perspective view of the design shown in FIG. 1, withthe window shade in a closed position; and,

FIG. 3 is a front view of the design shown in FIG. 1.

The dot-dash lines in FIG. 3 show an unclaimed boundary which forms nopart of the claimed design.

CLAIM The ornamental design for a window frame, as shown and described.